3 sides = Triangle
4 sides = Quadrilateral
5 sides = Pentagon
6 sides = Hexagon
7 sides = Heptagon
8 sides = Octagon
9 sides = Nonagon
10 sides = Decagon.
12 sides = Dodecagon
any other number after these or a shape with 11 sides .. you use the number of sides and put "gon" after.. for example if you have 13 sides. you would put 13-gon
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Regular polygons are those polygons that are bothequilateral (all sides congruent) and equilateral (all interior angles congruent).
No only regular polygons have congruent angles.
regular polygons
Isolateral polygons. They need not be regular polygons. For example, a rhombus has all congruent sides but it is not a regular polygon.
A regular polygon.Equilateral triangle and square are examples of regular polygons (those two have special names).